Definition
verb
expresses the goodness of the following verb; it is needed, one ought to [with infinitive]
“Trzeba trochę poczekać.”
expresses the naturalness or obviousness of the following verb; ought to, must [with infinitive]
“Trzeba powiedzieć, że to było dobre.”
expresses the necessity or obligation of the following verb; it is needed, one ought to [with dative ‘for whom’; in addition, with infinitive ‘to do something’; or with genitive ‘what is needed’]
“Trzeba ci wiedzieć.”
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